2004 Pilot: engine sometimes revs up and down while idling and sometimes stalls. - Page 2 - Honda Pilot - Honda Pilot Forums

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Old 06-08-2012, 09:43 PM   #16 (permalink)
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Check the timing belt marks and make sure they all line up.
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Old 06-08-2012, 10:22 PM   #17 (permalink)
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Check Fuel pressure regulator, if the Pilot has one. It relies on vacuum to regulate the fuel pressure. Easy to test with vacuum pump.

Fuel filter? Fuel pump? Pumps can be erratic before total failure. Have pump pressure checked and change the filter.

What is the engine vacuum at idle hot and cold?

Engine computer could be intermittently bad. Chip or transistor could be on the way out. They act up before total failure.

TPS on the intake throttle is suspect.

Mass air flow regulator is highly suspect.

A poor or open ground in the wiring (the shield replacement) will create all kinds of havoc.
Mechanic should inspect previous work for damage.

As suggested, poor Battery voltage and current can create havoc.

Find you a willing Mechanic that will logically work these suggestions. I have little faith in your dealer at this point. A good independent Honda shop would be my choice.

Keep us posted.
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Old 06-10-2012, 05:03 PM   #18 (permalink)
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Default Had battery and alternator tested.

Apparently one cell of the battery is dead. This wouldn't contribute to the cars problems would it?

Also, yesterday the check oil light started flashing. I checked the oil and the level was fine. It turns off after I turn the car off and turn it back on.

I also put in some injector cleaner but it hasn't made a difference.

Thanks for your suggestions. I think I'm going to replace the fuel filter next.
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Old 06-10-2012, 10:37 PM   #19 (permalink)
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I can't speak to this car, but on other cars a bad battery will do all kinds of crazy things.
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Old 06-10-2012, 11:06 PM   #20 (permalink)
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A bad battery will cause all kinds of erratic behavior.
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Old 06-11-2012, 06:14 PM   #21 (permalink)
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Also, yesterday the check oil light started flashing. I checked the oil and the level was fine. It turns off after I turn the car off and turn it back on.
That's not good. This could be engine bearings.

Two reasons for the oil light to come on....
-Low Pressure
-Low Oil which leads to low pressure

If you have oil, then you have reduced pressure in the engines which can be the bearings worse case. I'd bring it in to the shop and delay the self diagnosis.
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Old 06-12-2012, 01:14 AM   #22 (permalink)
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Quote:
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Apparently one cell of the battery is dead. This wouldn't contribute to the cars problems would it?

Also, yesterday the check oil light started flashing. I checked the oil and the level was fine. It turns off after I turn the car off and turn it back on.

I also put in some injector cleaner but it hasn't made a difference.

Thanks for your suggestions. I think I'm going to replace the fuel filter next.

yes it would. When I lost a cell in the battery I got codes for all cylinder misfire and a random. Replace the battery first and go from there.
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Old 06-16-2012, 01:15 AM   #23 (permalink)
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I have some updates since my last post.
I replaced the battery and it made now difference.
I brought the car to a great local honda mechanic and replaced the idle control valve again and the air fuel sensor. The car still did the same thing so he drove the car for a while and had some of the other mechanics in the garage drive it. In addition they did some diagnostic test and the conclusion was that the torque converter is bad. This makes sense since in addition to the previously posted symptoms I have recently noticed that the pilot takes sometime to engage in reverse and drive. This is despite already replacing the engine mounts. The care is still idling rough and occasionally shudders at mostly lower speeds.
Do you think this sounds like the torque converter and should I replace the torque converter or the converter and the transmission.
This car also has a recall on the tranny and had a oil heat shield put in at 2200 miles. Do you think that this problem is related to the recall. Thanks!
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Old 06-16-2012, 01:23 AM   #24 (permalink)
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So I replaced the battery and there was no change.
I found a really great local honda mechanic and he replaced the idle control valve and the air fuel sensor. The car still had the same problems.
He did some additional diagnostic tests and drove the car for a while and has made the diagnosis of a bad torque converter. This seems to fit with symptoms that my car has had. In addition I have noticed that it takes a while to engage in reverse and drive even after the motor mounts were replaced.
does this sound like a reasonable diagnosis? Should I get the torque converter replaced or both the torque converter and tranny?
The transmission had a recall on it and a oil heat child was put in. Is the current problem related to the recall?
Thanks!
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Old 06-16-2012, 04:46 AM   #25 (permalink)
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You said in the first post hesitating on the highway.
What speed? 30-45mph? If so I'd go with third and fourth gear pressure switches replacement.
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Old 06-18-2012, 05:04 PM   #26 (permalink)
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Not me, as I have replaced mine....exact symptom.
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Old 06-18-2012, 06:05 PM   #27 (permalink)
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Any update?
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